Machine for grinding battery jars



Feb. 13, 1923.

E. J. KROEGER.

MACHINE FOR GRINDING BATTERY JARS.

2 SHEETS-SHEET l- FILED JUNE 26,19l8.

Feb. 13, 1923. 1,445,327.

' E. J. KROEGER MACHINE FOR GRINDING BATTERY JARS.

FILED JUNEZB, 1918. 2SHEETSSHEET 2.

A TTORNEY of Ohio. have invented a her battery jars,

Patented Feb. 13, 19230 EDWIN J. KROEGER, OF AKRON. OHIO, AS

M'ACHINE FC'R GRINDING BATTERY Application filed June 26,

T 0 all 10]! 0m it may, conceive.

e it known that I. Enwin J. linonsnu a citizen of the United States residing at- Akron. in the county of Summit and State certain new and useful Machine for GrindingBattery Jars of which the following: is a specification.

This invention relates to machines for grinding the external surfaces of hard-ruband especially the larger sizes such as are used for submarine vessels, in order that a number of in battery may fill an allotted space in a containing chamber orrack with very small tolerance. My object is to enable the grinding opera tion to be quickly and accurately performed.

Of the accompanying drawings,

F ig. 1 is a side elevation of a jar-grindmachine constructed according to my 0 invention.

' 7| ng mechanism Fig. 2 is a top plan view thereof.

Fig. 3 is a longitudinal sect-ion of the work-supporting mandrel.

Fig. 4 is a cross Section of the latter on the line ehl of Fig. 3. i

In the drawings, 10 is the fixed base of the machine, and 11 is the movable bed or platen mounted to reciprocate horizontally on guideways 12 on said bed and provided with suitable driving and automatic reverspartly shown at 13, 14; in Figs. 1 and 2. 15 is an arch or standard for supporting the grinding wheel 16 which is journa-led in bearing- 17 on a slide 18 adapted tobe moved vertically to pe form the finer adjustments of the grinding wheel by means of suitable gearing shown partly at 19 and incluiilingr a. transverse worm shaft 20 and hand wheel 21. The said slide is superposed upon a slide 22 which travels on guides 23 on the standard 1:) and is movable vertically to perform the larger adjustments of the grinding wheel by means of gearing partly shown at and including a transverse shaft 25 having a crank handle 26 at one end. The grinding wheel is rapidly rotated by means of a belt 2? and pulley 28.

The grinding wheel 16, as indicated in Fig. 2, isinade up of a series of separate disks lb of suitable abrasive material,

clamped together on the shaft 29 by means of end plates 30, and together forming a surface of suitable cylindrical I grinding entire width of the length to take in the SIGNOB T0 1 OF NEW YORK, N. Y., A CORPORATION 1 NEW guides 38.

GOODRICH COIPIPANY,

JARS.

1918. Serial No. 242,601. I work without any crossfeed. In order to insure a smooth surface on the work free from marks or raised portions at the joints between the disks 16, the shaft 29 of the grinding wheel is slantingly disposed at a slight departure from a right angle with. reference to the direction of travel of. the work-supporting bed 11.

e jar 31, which is represented by broken lines in Figs. 1 and 2, is supported on an internal-g'ripping cxpansible chuck or mandrel comprising four jaw plates 33 adapted to grip the work by engaging the inner surfaces of its four side walls an arbor 3a: having three pyramidal wedges 35 engaging compleinental wedge surfaces 36 on the jaw plates, and a rotatable end plate 37 having radial sliding engagement withv the jaw plates by means of dovetail The arbor 3-1 is supported in the two arms of a, standard 39 bolted on one end of the traveling bed 11, and. provided with a screw thread 4-0 engaging a haniil-wheel nut all, which movement between saidarms for the purpose of adjusting the arbor longitudilnilly. The end plate 37 is registered in an one of four rotativc positions by means of a spring bolt 4:2 on the standard 39 engaging apertures in the plate, and is adapted work- IO to be rigidly clamped in any of these posit'ons means of bolts as; (his: 2) occupyn'igr a circular T-slot if (his. 8 in said plate 37. Each v plate in conveniently made in. two sections dovetailed and boltdv together; the inner section El -5* bearing against the wedges 35,11nd tic outer section 38 engaging the work. A l movement of the arbor 3st to the r H; as viewed in Fig. produced by rotation of the hand-wheel nut -lgl, expands the man drcl 32- a; I r. the worle and, when said arbor is moved in the opposite direction, the mandrel is contracted by a pair of an nular coiled s n'ings 46, 1-157 einln'aciiug the inner jaw-plate nieinbers $33.

A pair of leveling; screws l-Ih -19 interposed between the bed 11 and the we a; assist in supporting the weight of the man drel with the jar thereon and adjusting the work to a truly horizontal position. i

in the operation of my invention, the jar 31 to be ground slipped over the mandrel 32 while the latter collapsed and withdrawn from under the grinding wheel is held from axial and the end plate tery jars comprising); an

of thebed ll to the right, expanded to grip forth under the grinding wheel 16, and a true surface is ground thereon by means of sald wheel. The opposite surface may then be ground by turning the mandrel to bring it into proper position, and when the de sired width of jar is obtained between said surfaces, the other two surfaces may be ground in like manner.

I claim:

1. A machine for grinding storage-batexpanding rotatable mandrel for insertion within the jar, hav ing a series of jaws for engaging the inner sides of the ar walls, means for operating said jaws, means for fixing said mandrel in different predetermined rotary positions for presenting}; the several sides of the work,

to be ground, an abrasive wheel adapted to I grind the sides of a jar supported on said mandrel, and means for imparting); a relative feed motion to said mandrel and wheel longitudinally of the mandrel.

2. In a machine for grinding storagebattery jars, the combination of an abrz sire wheel, a mandrel support having a relative longitudinal feeding; movement with respect to said wheel, an expansible inside-gripping mandrel mounted on said support and including an axially-adjustable central arbor having a series of wedges, a support for said arbor, means for adjusting said arbor axially of the support, a series of gripping jaws radially adjustable by means of said wedges, a rotary end plate having radial guides for said jaws, and means for clamping said end plate to said support in positions successively presenting the different side faces of the work to the action of said grinding wheel.

3. In a machine for grinding storagebattery jars, the combination of a horizontal inside-gripping expansible work supporh ing mandrel, means: for supporting; said mandrel by one end, a leveling screw adapted to engage the unler side of the work, an abrasive wheel, and means for imparting a relative feeding movement to said mandrel and wheel l, In a machine for grinding storage battery jars, the combination of reciprocating bed, an expansible, projecting, workholding mandrel mounted thereon and adapted to be fixed in different predetermined rotary positions for presenting the several sides of the work to be ground, a grinding-wheel shaft mounted transversely and obliquely with respect to the path of movement of said work holder, and a cylindrical grinding wheel mounted on said shaft.

In testimony whereof I have hereunto set my hand this twenty-first day ofJune 1918.

EDWIN J KROEGER. 

